/**
 * GenCalc - Main Stylesheet
 * Estilos base, reset e layout principal
 */
/**
 * GenCalc v0.0.11
 * Build: b30979ff
 */

/* ============================================
   RESET E BASE
   ============================================ */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Cores Dark Theme */
    --bg-primary: #111827;
    --bg-secondary: #1f2937;
    --bg-tertiary: #374151;
    --text-primary: #ffffff;
    --text-secondary: #9ca3af;
    --text-tertiary: #6b7280;

    /* Cores de Destaque */
    --color-primary: #6366f1;
    --color-primary-hover: #4f46e5;
    --color-success: #10b981;
    --color-success-hover: #059669;
    --color-warning: #f59e0b;
    --color-warning-hover: #d97706;
    --color-danger: #ef4444;
    --color-danger-hover: #dc2626;
    --color-orange: #f97316;
    --color-orange-hover: #ea580c;

    /* Botões Calculadora */
    --btn-gray: #d1d5db;
    --btn-gray-hover: #9ca3af;
    --btn-dark-gray: #374151;
    --btn-dark-gray-hover: #4b5563;

    /* Sombras */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

    /* Transições */
    --transition-fast: 150ms ease-in-out;
    --transition-normal: 200ms ease-in-out;
    --transition-slow: 300ms ease-in-out;

    /* Bordas */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-3xl: 2rem;

    /* Espaçamentos */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Fontes */
    --font-sans:
        -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
        Arial, sans-serif;
    --font-mono:
        "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas,
        "Courier New", monospace;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    height: 100%;
    width: 100%;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    height: 100vh;
    overflow-x: hidden;
    overflow-y: hidden;
    line-height: 1.5;
    -webkit-tap-highlight-color: transparent;
    margin: 0;
    padding: 0;
}

/* ============================================
   SCROLLBAR CUSTOMIZADA
   ============================================ */

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: var(--radius-lg);
}

::-webkit-scrollbar-thumb:hover {
    background: #4b5563;
}

/* Hide scrollbar utility class */
.scrollbar-hide {
    -ms-overflow-style: none;
    scrollbar-width: none;
}

.scrollbar-hide::-webkit-scrollbar {
    display: none;
}

/* ============================================
   LOADING SCREEN
   ============================================ */

.loading-screen {
    position: fixed;
    inset: 0;
    background: linear-gradient(
        135deg,
        var(--bg-primary) 0%,
        rgba(17, 24, 39, 0.98) 100%
    );
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition:
        opacity 0.2s ease,
        visibility 0.2s ease,
        transform 0.2s ease;
}

.loading-screen.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: scale(0.95);
}

.loader {
    width: 56px;
    height: 56px;
    border: 4px solid rgba(139, 92, 246, 0.2);
    border-top-color: var(--color-primary);
    border-right-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.6s cubic-bezier(0.4, 0, 0.2, 1) infinite;
    box-shadow:
        0 0 20px rgba(139, 92, 246, 0.3),
        inset 0 0 10px rgba(139, 92, 246, 0.1);
}

.loading-screen p {
    margin-top: var(--spacing-lg);
    color: var(--text-primary);
    font-size: 0.9375rem;
    font-weight: 500;
    animation: pulse 1.5s ease-in-out infinite;
    text-shadow: 0 0 10px rgba(139, 92, 246, 0.3);
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* ============================================
   INSTALL PROMPT (PWA)
   ============================================ */

.install-prompt {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    max-width: 400px;
    width: calc(100% - 2rem);
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-2xl);
    z-index: 10000;
    animation: popIn 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
}

.install-prompt::before {
    content: "";
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    z-index: -1;
    animation: fadeIn 0.3s ease;
    backdrop-filter: blur(5px);
}

.install-prompt.hidden {
    display: none;
}

.install-prompt-content h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.install-prompt-content p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    font-size: 0.875rem;
}

.install-prompt-buttons {
    display: flex;
    gap: var(--spacing-sm);
}

.btn-install,
.btn-dismiss {
    flex: 1;
    padding: 0.75rem var(--spacing-md);
    border: none;
    border-radius: var(--radius-lg);
    font-size: 0.9375rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.btn-install {
    background: linear-gradient(
        145deg,
        var(--bg-secondary),
        rgba(31, 41, 55, 0.95)
    );
    border: 1px solid rgba(139, 92, 246, 0.3);
    color: var(--color-primary);
    font-weight: 700;
    box-shadow:
        0 6px 16px rgba(139, 92, 246, 0.25),
        0 2px 8px rgba(0, 0, 0, 0.3),
        inset 0 1px 2px rgba(255, 255, 255, 0.15);
}

.btn-install::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        135deg,
        rgba(139, 92, 246, 0.1),
        rgba(59, 130, 246, 0.1)
    );
    opacity: 1;
    transition: opacity 0.3s ease;
}

.btn-install::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%) scaleX(1);
    width: 80%;
    height: 2px;
    background: linear-gradient(
        90deg,
        transparent,
        var(--color-primary),
        transparent
    );
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-install:hover {
    background: linear-gradient(
        145deg,
        rgba(75, 85, 99, 0.8),
        rgba(55, 65, 81, 0.6)
    );
    color: var(--text-primary);
    transform: translateY(-1px);
    box-shadow:
        0 4px 8px rgba(0, 0, 0, 0.3),
        inset 0 1px 2px rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.1);
}

.btn-install:hover::before {
    opacity: 1;
}

.btn-install:active {
    transform: translateY(0);
}

.btn-dismiss {
    background: transparent;
    border: 2px solid var(--border-color);
    color: var(--text-secondary);
}

.btn-dismiss:hover {
    background: rgba(75, 85, 99, 0.5);
    color: var(--text-primary);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-1px);
}

.btn-dismiss:active {
    transform: translateY(0);
}

@keyframes slideUp {
    from {
        transform: translateY(100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

@keyframes popIn {
    0% {
        transform: translate(-50%, -50%) scale(0.8);
        opacity: 0;
    }
    70% {
        transform: translate(-50%, -50%) scale(1.05);
    }
    100% {
        transform: translate(-50%, -50%) scale(1);
        opacity: 1;
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* ============================================
   APP CONTAINER
   ============================================ */

.app-container {
    min-height: 100vh;
    height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    padding: 0;
    max-width: 100%;
    overflow: hidden;
}

/* ============================================
   HEADER
   ============================================ */

.app-header {
    width: 100%;
    max-width: 100%;
    margin-bottom: 0;
    flex-shrink: 0;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
}

.app-title-container {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.app-logo {
    width: 48px;
    height: 48px;
    border-radius: 0.5rem;
    object-fit: contain;
}

.app-title {
    font-family: "Orbitron", var(--font-sans);
    font-size: 1.5rem;
    font-weight: 900;
    margin: 0;
    background: linear-gradient(135deg, #8b5cf6 0%, #6366f1 50%, #3b82f6 100%);
    background-size: 200% 200%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 0.05em;
    text-shadow:
        0 0 20px rgba(139, 92, 246, 0.5),
        0 0 40px rgba(99, 102, 241, 0.3);
    animation: titleGlow 3s ease-in-out infinite;
    position: relative;
}

@keyframes titleGlow {
    0%,
    100% {
        background-position: 0% 50%;
        filter: brightness(1);
    }
    50% {
        background-position: 100% 50%;
        filter: brightness(1.2);
    }
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-lg);
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-btn:hover {
    color: var(--color-primary);
    background: var(--bg-tertiary);
}

.icon-btn .icon {
    width: 24px;
    height: 24px;
}

/* ============================================
   PRO BADGE
   ============================================ */

.pro-badge-active {
    background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 50%, #d97706 100%);
    color: white;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    box-shadow:
        0 4px 15px rgba(251, 191, 36, 0.4),
        0 0 20px rgba(251, 191, 36, 0.3),
        inset 0 1px 1px rgba(255, 255, 255, 0.3);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    position: relative;
    overflow: hidden;
    animation: goldPulse 3s ease-in-out infinite;
}

.pro-badge-active::after {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: 9999px;
    padding: 1px;
    background: linear-gradient(135deg, #fde68a, #fbbf24, #f59e0b);
    -webkit-mask:
        linear-gradient(#fff 0 0) content-box,
        linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask:
        linear-gradient(#fff 0 0) content-box,
        linear-gradient(#fff 0 0);
    mask-composite: exclude;
    opacity: 0.6;
}

@keyframes goldPulse {
    0%,
    100% {
        box-shadow:
            0 4px 15px rgba(251, 191, 36, 0.4),
            0 0 20px rgba(251, 191, 36, 0.3),
            inset 0 1px 1px rgba(255, 255, 255, 0.3);
    }
    50% {
        box-shadow:
            0 4px 20px rgba(251, 191, 36, 0.6),
            0 0 30px rgba(251, 191, 36, 0.5),
            inset 0 1px 1px rgba(255, 255, 255, 0.4);
    }
}

.pro-link {
    padding: 0.625rem var(--spacing-md);
    background: linear-gradient(
        145deg,
        var(--bg-secondary),
        rgba(31, 41, 55, 0.95)
    );
    border: 1px solid rgba(139, 92, 246, 0.3);
    color: var(--color-primary);
    font-size: 0.875rem;
    font-weight: 700;
    border-radius: 0.625rem;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-decoration: none;
    white-space: nowrap;
    position: relative;
    overflow: hidden;
    box-shadow:
        0 6px 16px rgba(139, 92, 246, 0.25),
        0 2px 8px rgba(0, 0, 0, 0.3),
        inset 0 1px 2px rgba(255, 255, 255, 0.15);
    animation: purplePulse 2.5s ease-in-out infinite;
}

@keyframes purplePulse {
    0%,
    100% {
        box-shadow:
            0 6px 16px rgba(139, 92, 246, 0.25),
            0 2px 8px rgba(0, 0, 0, 0.3),
            inset 0 1px 2px rgba(255, 255, 255, 0.15);
        border-color: rgba(139, 92, 246, 0.3);
    }
    50% {
        box-shadow:
            0 6px 20px rgba(139, 92, 246, 0.4),
            0 2px 12px rgba(139, 92, 246, 0.2),
            inset 0 1px 2px rgba(255, 255, 255, 0.2);
        border-color: rgba(139, 92, 246, 0.5);
    }
}

.pro-link::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        135deg,
        rgba(139, 92, 246, 0.1),
        rgba(59, 130, 246, 0.1)
    );
    opacity: 1;
    transition: opacity 0.3s ease;
}

.pro-link::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 80%;
    height: 2px;
    background: linear-gradient(
        90deg,
        transparent,
        var(--color-primary),
        transparent
    );
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.pro-link:hover {
    background: linear-gradient(
        145deg,
        rgba(75, 85, 99, 0.8),
        rgba(55, 65, 81, 0.6)
    );
    color: var(--text-primary);
    transform: translateY(-1px);
    box-shadow:
        0 4px 8px rgba(0, 0, 0, 0.3),
        inset 0 1px 2px rgba(255, 255, 255, 0.1);
    border-color: rgba(139, 92, 246, 0.4);
    text-decoration: none;
}

.pro-link:hover::before {
    opacity: 1;
}

.pro-link:active {
    transform: translateY(0);
}

/* ============================================
   TAB NAVIGATION
   ============================================ */

.tab-navigation {
    width: 100%;
    max-width: 100%;
    display: flex;
    background: linear-gradient(
        180deg,
        rgba(88, 28, 135, 0.3) 0%,
        rgba(67, 20, 100, 0.4) 50%,
        rgba(49, 15, 73, 0.5) 100%
    );
    padding: 0.5rem var(--spacing-md);
    border-radius: 0;
    margin-bottom: 0;
    gap: 0.5rem;
    flex-shrink: 0;
    box-shadow:
        0 4px 12px rgba(139, 92, 246, 0.3),
        0 2px 8px rgba(0, 0, 0, 0.3),
        inset 0 1px 0 rgba(139, 92, 246, 0.2);
    border-bottom: 2px solid rgba(139, 92, 246, 0.4);
    border-top: 1px solid rgba(139, 92, 246, 0.1);
}

.tab-btn {
    flex: 1;
    padding: 0.625rem var(--spacing-md);
    background: linear-gradient(
        145deg,
        rgba(55, 65, 81, 0.6),
        rgba(31, 41, 55, 0.4)
    );
    border: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: 0.625rem;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    white-space: nowrap;
    position: relative;
    overflow: hidden;
    box-shadow:
        0 1px 3px rgba(0, 0, 0, 0.2),
        inset 0 1px 1px rgba(255, 255, 255, 0.05);
}

.tab-btn::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        135deg,
        rgba(139, 92, 246, 0.1),
        rgba(59, 130, 246, 0.1)
    );
    opacity: 0;
    transition: opacity 0.3s ease;
}

.tab-btn::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 80%;
    height: 2px;
    background: linear-gradient(
        90deg,
        transparent,
        var(--color-primary),
        transparent
    );
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.tab-btn:hover {
    background: linear-gradient(
        145deg,
        rgba(75, 85, 99, 0.8),
        rgba(55, 65, 81, 0.6)
    );
    color: var(--text-primary);
    transform: translateY(-1px);
    box-shadow:
        0 4px 8px rgba(0, 0, 0, 0.3),
        inset 0 1px 2px rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.1);
}

.tab-btn:hover::before {
    opacity: 1;
}

.tab-btn.active {
    background: linear-gradient(
        145deg,
        var(--bg-secondary),
        rgba(31, 41, 55, 0.95)
    );
    color: var(--color-primary);
    box-shadow:
        0 6px 16px rgba(139, 92, 246, 0.25),
        0 2px 8px rgba(0, 0, 0, 0.3),
        inset 0 1px 2px rgba(255, 255, 255, 0.15);
    border-color: rgba(139, 92, 246, 0.3);
    transform: translateY(0);
    font-weight: 700;
}

.tab-btn.active::before {
    opacity: 1;
}

.tab-btn.active::after {
    transform: translateX(-50%) scaleX(1);
}

/* ============================================
   CONTENT AREA
   ============================================ */

.content-area {
    width: 100%;
    max-width: 100%;
    background: var(--bg-secondary);
    border-radius: 0;
    box-shadow: none;
    overflow: hidden;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.tab-content {
    display: none;
    animation: fadeIn 0.3s ease;
    height: 100%;
    flex: 1;
}

.tab-content.active {
    display: flex;
    flex-direction: column;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================
   FEATURE CONTENT (Finance, Conversion, AI)
   ============================================ */

.feature-content {
    padding: var(--spacing-lg) var(--spacing-md);
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    min-height: 0;
}

.feature-title {
    font-family: "Orbitron", var(--font-sans);
    font-size: 1.875rem;
    font-weight: 900;
    text-align: center;
    margin-bottom: var(--spacing-lg);
    background: linear-gradient(135deg, #8b5cf6 0%, #6366f1 50%, #3b82f6 100%);
    background-size: 200% 200%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 0.05em;
    text-shadow:
        0 0 20px rgba(139, 92, 246, 0.5),
        0 0 40px rgba(99, 102, 241, 0.3);
    animation: titleGlow 3s ease-in-out infinite;
}

.feature-subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    font-size: 0.875rem;
}

.feature-note {
    text-align: center;
    color: var(--text-tertiary);
    font-size: 0.75rem;
    margin-top: var(--spacing-lg);
}

/* ============================================
   FORM INPUTS
   ============================================ */

.input-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.input-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.input-field,
.select-field,
.textarea-field {
    width: 100%;
    padding: 0.75rem;
    background: var(--bg-tertiary);
    border: 2px solid transparent;
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    font-size: 1rem;
    font-family: var(--font-sans);
    transition: all var(--transition-normal);
}

.input-field:focus,
.select-field:focus,
.textarea-field:focus {
    outline: none;
    border-color: var(--color-primary);
    background: #2d3748;
}

.input-field::placeholder,
.textarea-field::placeholder {
    color: var(--text-tertiary);
}

.select-field {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%239ca3af'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    background-size: 1.5em 1.5em;
    padding-right: 2.5rem;
}

.textarea-field {
    resize: vertical;
    min-height: 6rem;
    max-height: 12rem;
}

/* ============================================
   BUTTONS
   ============================================ */

.btn-primary {
    width: 100%;
    padding: 0.75rem var(--spacing-md);
    background: linear-gradient(
        145deg,
        var(--bg-secondary),
        rgba(31, 41, 55, 0.95)
    );
    border: 1px solid rgba(139, 92, 246, 0.3);
    color: var(--color-primary);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow:
        0 6px 16px rgba(139, 92, 246, 0.25),
        0 2px 8px rgba(0, 0, 0, 0.3),
        inset 0 1px 2px rgba(255, 255, 255, 0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    position: relative;
    overflow: hidden;
}

.btn-primary::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        135deg,
        rgba(139, 92, 246, 0.1),
        rgba(59, 130, 246, 0.1)
    );
    opacity: 1;
    transition: opacity 0.3s ease;
}

.btn-primary::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%) scaleX(1);
    width: 80%;
    height: 2px;
    background: linear-gradient(
        90deg,
        transparent,
        var(--color-primary),
        transparent
    );
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-primary:hover {
    background: linear-gradient(
        145deg,
        rgba(75, 85, 99, 0.8),
        rgba(55, 65, 81, 0.6)
    );
    color: var(--text-primary);
    transform: translateY(-1px);
    box-shadow:
        0 4px 8px rgba(0, 0, 0, 0.3),
        inset 0 1px 2px rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.1);
}

.btn-primary:hover::before {
    opacity: 1;
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-primary svg {
    width: 1.125rem;
    height: 1.125rem;
}

.btn-primary:disabled {
    background: rgba(55, 65, 81, 0.3);
    cursor: not-allowed;
    opacity: 0.5;
    border-color: rgba(255, 255, 255, 0.02);
}

.btn-purchase {
    width: 100%;
    padding: 0.875rem var(--spacing-lg);
    background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 50%, #d97706 100%);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-xl);
    font-family: "Orbitron", var(--font-sans);
    font-size: 1.125rem;
    font-weight: 900;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow:
        0 10px 30px rgba(251, 191, 36, 0.5),
        0 0 40px rgba(251, 191, 36, 0.4),
        inset 0 2px 4px rgba(255, 255, 255, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    text-shadow: 0 4px 8px rgba(0, 0, 0, 0.6);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    position: relative;
    overflow: hidden;
    animation: goldPulse 2s ease-in-out infinite;
    will-change: transform, box-shadow;
    transform: translateZ(0);
}

.btn-purchase::after {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: var(--radius-lg);
    padding: 1px;
    background: linear-gradient(135deg, #fde68a, #fbbf24, #f59e0b);
    -webkit-mask:
        linear-gradient(#fff 0 0) content-box,
        linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask:
        linear-gradient(#fff 0 0) content-box,
        linear-gradient(#fff 0 0);
    mask-composite: exclude;
    opacity: 0.6;
}

.btn-purchase:hover {
    background: linear-gradient(135deg, #f59e0b 0%, #d97706 50%, #b45309 100%);
    transform: translateY(-4px) scale(1.02);
    box-shadow:
        0 25px 50px rgba(251, 191, 36, 0.7),
        0 0 60px rgba(251, 191, 36, 0.6),
        inset 0 2px 4px rgba(255, 255, 255, 0.5);
    border-color: rgba(255, 255, 255, 0.5);
}

.btn-purchase:active {
    transform: translateY(-1px) scale(0.98);
}

.btn-text {
    width: 100%;
    padding: var(--spacing-sm);
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: color var(--transition-normal);
}

.btn-text:hover {
    color: var(--text-primary);
}

/* ============================================
   RESULT BOX
   ============================================ */

.result-box {
    background: var(--bg-tertiary);
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    margin-top: var(--spacing-lg);
}

.result-box.hidden {
    display: none;
}

.result-label {
    color: var(--text-secondary);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-sm);
}

.result-value {
    color: var(--color-primary);
    font-size: 2.25rem;
    font-weight: 800;
    margin-top: var(--spacing-xs);
}

/* ============================================
   AI RESULT BOX
   ============================================ */

.ai-result-box {
    margin-top: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: linear-gradient(
        135deg,
        rgba(139, 92, 246, 0.15) 0%,
        rgba(99, 102, 241, 0.1) 50%,
        rgba(139, 92, 246, 0.15) 100%
    );
    backdrop-filter: blur(10px);
    border: 1px solid rgba(139, 92, 246, 0.3);
    border-radius: var(--radius-xl);
    min-height: 8rem;
    max-height: calc(100vh - 400px);
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    box-shadow: 0 8px 32px rgba(139, 92, 246, 0.15);
}

.ai-result {
    color: var(--text-primary);
    word-wrap: break-word;
    line-height: 1.6;
    font-size: 0.9375rem;
}

/* Custom purple scrollbar for AI result */
.ai-result-box::-webkit-scrollbar {
    width: 8px;
}

.ai-result-box::-webkit-scrollbar-track {
    background: rgba(31, 41, 55, 0.5);
    border-radius: 10px;
}

.ai-result-box::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, #8b5cf6, #3b82f6);
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(139, 92, 246, 0.5);
}

.ai-result-box::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, #7c3aed, #2563eb);
    box-shadow: 0 0 15px rgba(139, 92, 246, 0.8);
}

.ai-result::-webkit-scrollbar {
    width: 6px;
}

.ai-result::-webkit-scrollbar-track {
    background: rgba(31, 41, 55, 0.3);
    border-radius: 10px;
}

.ai-result::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, #8b5cf6, #3b82f6);
    border-radius: 10px;
}

.ai-result::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, #7c3aed, #2563eb);
}

/* Markdown content styling */
.ai-result p {
    margin: 0.5rem 0;
}

.ai-result h1,
.ai-result h2,
.ai-result h3 {
    margin-top: 1rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.ai-result h1 {
    font-size: 1.25rem;
}

.ai-result h2 {
    font-size: 1.1rem;
}

.ai-result h3 {
    font-size: 1rem;
}

.ai-result ul,
.ai-result ol {
    margin: 0.5rem 0;
    padding-left: 1.5rem;
}

.ai-result li {
    margin: 0.25rem 0;
}

.ai-result code {
    background: rgba(0, 0, 0, 0.2);
    padding: 0.125rem 0.25rem;
    border-radius: 0.25rem;
    font-family: "Courier New", monospace;
    font-size: 0.875rem;
}

.ai-result pre {
    background: rgba(0, 0, 0, 0.2);
    padding: 0.75rem;
    border-radius: 0.5rem;
    overflow-x: auto;
    margin: 0.5rem 0;
}

.ai-result pre code {
    background: none;
    padding: 0;
}

/* Math formulas styling */
.ai-result .katex {
    font-size: 1.05em;
}

.ai-result .katex-display {
    margin: 1rem 0;
    overflow-x: auto;
    overflow-y: hidden;
}

.ai-result strong {
    font-weight: 600;
    color: var(--text-primary);
}

.ai-result em {
    font-style: italic;
}

.ai-result blockquote {
    border-left: 3px solid var(--primary);
    padding-left: 1rem;
    margin: 0.5rem 0;
    color: var(--text-secondary);
}

/* ============================================
   SPINNER
   ============================================ */

.spinner {
    width: 1.25rem;
    height: 1.25rem;
    animation: spin 1s linear infinite;
}

.spinner.hidden {
    display: none;
}

/* ============================================
   UTILITIES
   ============================================ */

.hidden {
    display: none !important;
}

.text-center {
    text-align: center;
}

.mt-1 {
    margin-top: var(--spacing-xs);
}
.mt-2 {
    margin-top: var(--spacing-sm);
}
.mt-3 {
    margin-top: var(--spacing-md);
}
.mt-4 {
    margin-top: var(--spacing-lg);
}

.mb-1 {
    margin-bottom: var(--spacing-xs);
}
.mb-2 {
    margin-bottom: var(--spacing-sm);
}
.mb-3 {
    margin-bottom: var(--spacing-md);
}
.mb-4 {
    margin-bottom: var(--spacing-lg);
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 640px) {
    .app-container {
        padding: 0;
    }

    .app-logo {
        width: 40px;
        height: 40px;
    }

    .app-title {
        font-size: 1.25rem;
        letter-spacing: 0.03em;
        font-size: 1.25rem;
    }

    .gennisys-banner {
        font-size: 0.5625rem;
        padding: 0.18rem 0.45rem;
    }

    .feature-title {
        font-size: 1.5rem;
    }

    .tab-btn {
        font-size: 0.75rem;
        padding: 0.5rem var(--spacing-sm);
    }

    .feature-content {
        padding: var(--spacing-md);
    }

    .ai-result-box {
        max-height: calc(100vh - 350px);
        min-height: 6rem;
    }
}

@media (max-height: 700px) {
    .ai-result-box {
        max-height: calc(100vh - 300px);
        min-height: 5rem;
    }
}

@media (max-height: 620px) {
    .ai-result-box {
        max-height: calc(100vh - 250px);
        min-height: 4rem;
    }
}

@media (min-width: 768px) {
    .app-container {
        padding: 0;
    }
}

/* ============================================
   SAFE AREA (iOS notch support)
   ============================================ */

@supports (padding: max(0px)) {
    .app-container {
        padding-left: 0;
        padding-right: 0;
        padding-bottom: 0;
        padding-top: env(safe-area-inset-top);
    }

    .header-content {
        padding-left: max(var(--spacing-md), env(safe-area-inset-left));
        padding-right: max(var(--spacing-md), env(safe-area-inset-right));
    }

    .tab-navigation {
        padding-left: max(var(--spacing-md), env(safe-area-inset-left));
        padding-right: max(var(--spacing-md), env(safe-area-inset-right));
    }
}