/* ===================================
   PhonoFlow - Shared Stylesheet
   ================================== */

/* --- LIGHT THEME (default) --- */
:root {
    --pf-midnight: #FFFFFF;
    --pf-slate: #F4F6FF;
    --pf-coral: #1E3A8A;
    --pf-gold: #334E9E;
    --pf-text: #0B0F14;
    --pf-text-secondary: #475569;
    --pf-mint: #1B7A55;
    --pf-border: #D4DAF0;
    --pf-input-bg: rgba(0, 0, 0, 0.04);
    --pf-nav-bg: rgba(244, 246, 255, 0.9);
    --pf-hero-gradient-start: #F0F0F2;
    --pf-hero-gradient-end: #FFFFFF;
    --pf-accent-bg: rgba(30, 58, 138, 0.06);
}

/* --- DARK THEME --- */
[data-theme="dark"] {
    --pf-midnight: #1C1C1E;
    --pf-slate: #2C2C2E;
    --pf-coral: #2F5BFF;
    --pf-gold: #5A8AFF;
    --pf-text: #F0F0F0;
    --pf-text-secondary: #A0A0A0;
    --pf-mint: #2D9F7A;
    --pf-border: #3A3A3C;
    --pf-input-bg: rgba(0, 0, 0, 0.3);
    --pf-nav-bg: rgba(44, 44, 46, 0.85);
    --pf-hero-gradient-start: #2C2C2E;
    --pf-hero-gradient-end: #1C1C1E;
    --pf-accent-bg: rgba(47, 91, 255, 0.12);
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--pf-midnight);
    color: var(--pf-text);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color 0.3s, color 0.3s;
}

/* --- NAVIGATION --- */
nav {
    height: 70px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 5%;
    position: fixed;
    width: 100%;
    top: 0;
    background: var(--pf-nav-bg);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--pf-border);
    z-index: 1000;
    transition: background 0.3s, border-color 0.3s;
}

.logo {
    font-size: 22px;
    font-weight: 800;
    color: var(--pf-coral);
    text-decoration: none;
}

.logo span {
    color: var(--pf-text);
}

.nav-links {
    display: flex;
    gap: 30px;
    align-items: center;
}

.nav-links a {
    color: var(--pf-text);
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
    opacity: 0.8;
    transition: all 0.2s;
}

.nav-links a:hover {
    opacity: 1;
    color: var(--pf-gold);
}

.nav-links a.active {
    color: var(--pf-gold);
    opacity: 1;
}

/* --- THEME TOGGLE --- */
.theme-toggle {
    background: var(--pf-slate);
    border: 1px solid var(--pf-border);
    border-radius: 50%;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--pf-text);
    transition: background 0.3s, border-color 0.3s, transform 0.2s, color 0.3s;
    flex-shrink: 0;
    padding: 0;
}

.theme-toggle:hover {
    transform: scale(1.1);
    border-color: var(--pf-coral);
}

/* --- REUSABLE COMPONENTS --- */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 5%;
}

.btn {
    display: inline-block;
    padding: 16px 32px;
    border-radius: 12px;
    font-weight: 700;
    text-decoration: none;
    transition: 0.3s;
    cursor: pointer;
    border: none;
    font-size: 1rem;
}

.btn-primary {
    background: var(--pf-coral);
    color: #FFFFFF;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(30, 58, 138, 0.3);
}

[data-theme="dark"] .btn-primary:hover {
    box-shadow: 0 10px 20px rgba(47, 91, 255, 0.3);
}

.btn-secondary {
    background: var(--pf-gold);
    color: #FFFFFF;
}

.btn-outline {
    border: 2px solid var(--pf-coral);
    background: transparent;
    color: var(--pf-coral);
}

.btn-outline:hover {
    background: var(--pf-coral);
    color: #FFFFFF;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: 50px;
}

.section-title span {
    color: var(--pf-coral);
}

/* --- CARDS --- */
.card {
    background: var(--pf-slate);
    padding: 30px;
    border-radius: 20px;
    border: 1px solid var(--pf-border);
    transition: all 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    border-color: var(--pf-gold);
}

/* --- HERO SECTION --- */
.hero {
    padding: 140px 5% 100px;
    text-align: center;
    background: radial-gradient(circle at top, var(--pf-hero-gradient-start) 0%, var(--pf-hero-gradient-end) 60%);
    transition: background 0.3s;
}

.hero h1 {
    font-size: 4rem;
    line-height: 1.1;
    margin-bottom: 25px;
    font-weight: 800;
}

.hero p {
    font-size: 1.25rem;
    max-width: 750px;
    margin: 0 auto 40px;
    color: var(--pf-text-secondary);
}

/* --- GRID LAYOUTS --- */
.grid {
    display: grid;
    gap: 30px;
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

/* --- FOOTER --- */
footer {
    padding: 50px 0;
    border-top: 1px solid var(--pf-border);
    text-align: center;
    color: var(--pf-text-secondary);
    font-size: 14px;
    transition: border-color 0.3s;
}

/* --- RESPONSIVE --- */
@media (max-width: 768px) {
    nav {
        height: auto;
        flex-direction: column;
        padding: 15px 5%;
        gap: 10px;
        position: fixed;
    }

    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 12px;
    }

    .nav-links .theme-toggle {
        position: absolute;
        top: 12px;
        right: 5%;
        width: 32px;
        height: 32px;
        font-size: 16px;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .section-title {
        font-size: 2rem;
    }
}