/**
 * SaveTik - Professional Stylesheet
 * https://www.savetik.tools
 * Version 2.0
 */

/* ============================================
   CSS Variables (Design Tokens)
============================================ */
:root {
    /* Brand Colors */
    --primary: #fe2c55;
    --primary-hover: #ff1744;
    --primary-light: rgba(254, 44, 85, 0.1);
    --secondary: #25f4ee;
    --secondary-hover: #00e5dc;
    
    /* Neutral Colors */
    --bg-primary: #000000;
    --bg-secondary: #0f0f0f;
    --bg-tertiary: #1a1a1a;
    --bg-card: #161616;
    --bg-card-hover: #1f1f1f;
    
    --border-color: #2a2a2a;
    --border-light: #333333;
    
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --text-muted: #666666;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--secondary) 0%, var(--primary) 100%);
    --gradient-bg: radial-gradient(ellipse 80% 50% at 50% -20%, rgba(254, 44, 85, 0.15), transparent);
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px rgba(254, 44, 85, 0.3);
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3.5rem;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
    
    /* Z-index */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-modal: 300;
    --z-toast: 400;
    
    /* Container */
    --container-max: 1200px;
    --container-narrow: 720px;
}

/* ============================================
   Reset & Base Styles
============================================ */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Background Effect */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background: var(--gradient-bg);
    pointer-events: none;
    z-index: -1;
}

a {
    color: inherit;
    text-decoration: none;
}

img, video {
    max-width: 100%;
    height: auto;
    display: block;
}

button, input, select, textarea {
    font-family: inherit;
    font-size: inherit;
}

ul, ol {
    list-style: none;
}

/* ============================================
   Utility Classes
============================================ */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.container--narrow {
    max-width: var(--container-narrow);
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.text-gradient {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ============================================
   Header
============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-sticky);
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    transition: background var(--transition-base);
}

.header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-weight: 800;
    font-size: var(--font-size-xl);
}

.logo__icon {
    width: 40px;
    height: 40px;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    box-shadow: var(--shadow-glow);
}

.logo__text span:first-child { color: var(--text-primary); }
.logo__text span:last-child { color: var(--primary); }

/* Navigation */
.nav {
    display: flex;
    align-items: center;
    gap: var(--space-8);
}

.nav__link {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: color var(--transition-fast);
}

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

/* Language Selector */
.lang-select {
    position: relative;
}

.lang-select__btn {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.lang-select__btn:hover {
    border-color: var(--primary);
    background: var(--bg-card-hover);
}

.lang-select__arrow {
    font-size: 10px;
    transition: transform var(--transition-fast);
}

.lang-select.is-open .lang-select__arrow {
    transform: rotate(180deg);
}

.lang-select__dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 180px;
    max-height: 320px;
    overflow-y: auto;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-fast);
    z-index: var(--z-dropdown);
}

.lang-select.is-open .lang-select__dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-select__item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    transition: all var(--transition-fast);
}

.lang-select__item:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
}

.lang-select__item.is-active {
    background: var(--primary-light);
    color: var(--primary);
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    width: 40px;
    height: 40px;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 24px;
    cursor: pointer;
}

/* ============================================
   Hero Section
============================================ */
.hero {
    padding: calc(72px + var(--space-16)) 0 var(--space-12);
    text-align: center;
}

.hero__badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: var(--primary-light);
    border: 1px solid rgba(254, 44, 85, 0.2);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--primary);
    margin-bottom: var(--space-8);
}

.hero__title {
    font-size: clamp(var(--font-size-3xl), 8vw, var(--font-size-5xl));
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: var(--space-6);
    letter-spacing: -0.02em;
}

.hero__subtitle {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto var(--space-12);
    line-height: 1.7;
}

/* ============================================
   Download Form
============================================ */
.download-form {
    max-width: 700px;
    margin: 0 auto;
}

.download-form__input-group {
    display: flex;
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-base);
}

.download-form__input-group:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px var(--primary-light);
}

.download-form__input {
    flex: 1;
    padding: var(--space-5) var(--space-6);
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: var(--font-size-base);
    outline: none;
    min-width: 0;
}

.download-form__input::placeholder {
    color: var(--text-muted);
}

.download-form__paste {
    display: none;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: 0 var(--space-4);
    background: transparent;
    border: none;
    border-left: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.download-form__paste:hover {
    color: var(--primary);
    background: var(--primary-light);
}

.download-form__submit {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-5) var(--space-8);
    background: var(--gradient-primary);
    border: none;
    color: white;
    font-size: var(--font-size-base);
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition-base);
    white-space: nowrap;
}

.download-form__submit:hover {
    filter: brightness(1.1);
    transform: scale(1.02);
}

.download-form__submit:active {
    transform: scale(0.98);
}

.download-form__hint {
    margin-top: var(--space-4);
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

.download-form__hint code {
    padding: var(--space-1) var(--space-2);
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    font-family: monospace;
    font-size: var(--font-size-xs);
}

/* ============================================
   Status Messages
============================================ */
.status {
    max-width: 600px;
    margin: var(--space-8) auto;
    padding: var(--space-6);
    border-radius: var(--radius-lg);
    text-align: center;
    display: none;
}

.status.is-visible {
    display: block;
}

.status--loading {
    background: var(--bg-card);
}

.status--error {
    background: rgba(254, 44, 85, 0.1);
    border: 1px solid rgba(254, 44, 85, 0.2);
    color: var(--primary);
}

.status--success {
    background: rgba(37, 244, 238, 0.1);
    border: 1px solid rgba(37, 244, 238, 0.2);
    color: var(--secondary);
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto var(--space-4);
}

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

/* ============================================
   Video Results
============================================ */
.results {
    max-width: 420px;
    margin: var(--space-12) auto;
    display: none;
}

.results.is-visible {
    display: block;
}

.video-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.video-card__preview {
    position: relative;
    aspect-ratio: 9/16;
    max-height: 400px;
    background: var(--bg-primary);
    overflow: hidden;
}

.video-card__preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.video-card__overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.8) 0%, transparent 50%);
}

.video-card__duration {
    position: absolute;
    bottom: var(--space-4);
    right: var(--space-4);
    padding: var(--space-1) var(--space-3);
    background: rgba(0,0,0,0.8);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    font-weight: 600;
}

.video-card__info {
    padding: var(--space-6);
}

.video-card__title {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin-bottom: var(--space-3);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.video-card__author {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    margin-bottom: var(--space-6);
}

/* Download Buttons */
.download-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.download-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-6);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
    text-align: center;
}

.download-btn--primary {
    background: var(--gradient-primary);
    color: white;
}

.download-btn--primary:hover {
    filter: brightness(1.1);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.download-btn--secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.download-btn--secondary:hover {
    border-color: var(--text-secondary);
    background: var(--bg-card-hover);
}

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

.download-btn--outline:hover {
    border-color: var(--secondary);
    color: var(--secondary);
}

/* ============================================
   Ad Container
============================================ */
.ad-container {
    max-width: 728px;
    margin: var(--space-12) auto;
    min-height: 90px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ============================================
   Features Section
============================================ */
.features {
    padding: var(--space-20) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-16);
}

.section-header__title {
    font-size: var(--font-size-3xl);
    font-weight: 800;
    margin-bottom: var(--space-4);
}

.section-header__subtitle {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    max-width: 500px;
    margin: 0 auto;
}

.features__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    transition: all var(--transition-base);
}

.feature-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.feature-card__icon {
    width: 64px;
    height: 64px;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    margin-bottom: var(--space-6);
    box-shadow: var(--shadow-glow);
}

.feature-card__title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--space-3);
}

.feature-card__desc {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ============================================
   How To Section
============================================ */
.how-to {
    padding: var(--space-20) 0;
    background: var(--bg-secondary);
}

.steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-8);
    margin-top: var(--space-16);
}

.step {
    text-align: center;
    position: relative;
}

.step__number {
    width: 80px;
    height: 80px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-3xl);
    font-weight: 800;
    margin: 0 auto var(--space-6);
    box-shadow: var(--shadow-glow);
}

.step__title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--space-3);
}

.step__desc {
    color: var(--text-secondary);
    max-width: 280px;
    margin: 0 auto var(--space-4);
    line-height: 1.7;
}

.step__tip {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    padding: var(--space-3);
    background: var(--bg-card);
    border-radius: var(--radius-md);
    max-width: 280px;
    margin: 0 auto;
}

/* ============================================
   FAQ Section
============================================ */
.faq {
    padding: var(--space-20) 0;
}

.faq__list {
    max-width: 800px;
    margin: var(--space-16) auto 0;
}

.faq-item {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-4);
    overflow: hidden;
}

.faq-item__question {
    width: 100%;
    padding: var(--space-6);
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: var(--font-size-base);
    font-weight: 600;
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: color var(--transition-fast);
}

.faq-item__question:hover {
    color: var(--primary);
}

.faq-item__icon {
    font-size: 20px;
    transition: transform var(--transition-base);
}

.faq-item.is-open .faq-item__icon {
    transform: rotate(45deg);
}

.faq-item__answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-base);
}

.faq-item.is-open .faq-item__answer {
    max-height: 500px;
}

.faq-item__answer-inner {
    padding: 0 var(--space-6) var(--space-6);
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ============================================
   SEO Content Section
============================================ */
.seo-content {
    padding: var(--space-16) 0;
    background: var(--bg-secondary);
}

.seo-content__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-8);
}

.seo-block {
    padding: var(--space-8);
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
}

.seo-block__title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--space-4);
}

.seo-block__content {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ============================================
   Footer
============================================ */
.footer {
    padding: var(--space-16) 0 var(--space-8);
    border-top: 1px solid var(--border-color);
}

.footer__grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--space-12);
    margin-bottom: var(--space-12);
}

.footer__brand {
    max-width: 300px;
}

.footer__brand .logo {
    margin-bottom: var(--space-4);
}

.footer__brand-desc {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    line-height: 1.7;
}

.footer__title {
    font-size: var(--font-size-sm);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: var(--space-4);
}

.footer__links {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.footer__link {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    transition: color var(--transition-fast);
}

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

.footer__bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--space-8);
    border-top: 1px solid var(--border-color);
}

.footer__copyright {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

.footer__disclaimer {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    max-width: 500px;
    text-align: right;
}

/* ============================================
   RTL Support
============================================ */
[dir="rtl"] {
    text-align: right;
}

[dir="rtl"] .download-form__input-group {
    flex-direction: row-reverse;
}

[dir="rtl"] .lang-select__dropdown {
    right: auto;
    left: 0;
}

[dir="rtl"] .faq-item__question {
    text-align: right;
}

[dir="rtl"] .footer__disclaimer {
    text-align: left;
}

/* ============================================
   Responsive Styles
============================================ */
@media (max-width: 1024px) {
    .features__grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer__grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    :root {
        --space-16: 3rem;
        --space-20: 4rem;
    }
    
    .nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-card);
        border-top: 1px solid var(--border-color);
        padding: var(--space-4);
        flex-direction: column;
        gap: 0;
        box-shadow: 0 10px 30px rgba(0,0,0,0.3);
    }
    
    .nav.is-open {
        display: flex;
    }
    
    .nav__link {
        padding: var(--space-4);
        border-bottom: 1px solid var(--border-color);
    }
    
    .nav__link:last-child {
        border-bottom: none;
    }
    
    .menu-toggle {
        display: flex;
    }
    
    .header__inner {
        position: relative;
    }
    
    .hero {
        padding-top: calc(72px + var(--space-10));
    }
    
    .download-form__input-group {
        flex-direction: column;
    }
    
    .download-form__paste {
        display: flex;
        border-left: none;
        border-top: 1px solid var(--border-color);
        padding: var(--space-4);
    }
    
    .download-form__submit {
        width: 100%;
    }
    
    .features__grid,
    .steps {
        grid-template-columns: 1fr;
    }
    
    .footer__grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer__brand {
        max-width: none;
    }
    
    .footer__bottom {
        flex-direction: column;
        gap: var(--space-4);
        text-align: center;
    }
    
    .footer__disclaimer {
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero__title {
        font-size: var(--font-size-3xl);
    }
    
    .hero__subtitle {
        font-size: var(--font-size-base);
    }
}