/* ==================== Переменные ==================== */
:root {
    --bg-color: #f8fafc;
    --text-color: #1e293b;
    --card-bg: #ffffff;
    --navbar-bg: rgba(15, 23, 42, 0.85);
    --primary: #2563eb;
    --accent: #3b82f6;
    --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    
    /* Навыки */
    --skills-bg: rgba(15, 23, 42, 0.9);
    --skills-border: rgba(255, 255, 255, 0.1);
    --skills-text: #f1f5f9;
    --skills-strong: #fff;
}

[data-theme="dark"] {
    --bg-color: #0f172a;
    --text-color: #f1f5f9;
    --card-bg: #1e293b;
    --navbar-bg: rgba(2, 6, 23, 0.85);
    --card-shadow: 0 10px 15px rgba(0, 0, 0, 0.5);
    
    /* Навыки (dark) */
    --skills-bg: rgba(59, 130, 246, 0.1);
    --skills-border: rgba(255, 255, 255, 0.2);
    --skills-text: #cbd5e1;
    --skills-strong: #fff;
}

body.hacker-mode {
    --skills-bg: rgba(0, 20, 0, 0.9);
    --skills-border: #00ff00;
    --skills-text: #00ff00;
    --skills-strong: #00ff00;
}

body.hacker-mode .eye-svg {
    color: #00ff00;
    filter: drop-shadow(0 0 8px #00ff00);
}

body.hacker-mode .eye-pupil {
    fill: #000;
}

body.retrowave-mode {
    --skills-bg: rgba(20, 0, 40, 0.9);
    --skills-border: #ff00ff;
    --skills-text: #fff;
    --skills-strong: #00ffff;
}

body.retrowave-mode .eye-svg {
    color: #ff00ff;
    filter: drop-shadow(0 0 8px #ff00ff);
}

body.retrowave-mode .eye-pupil {
    fill: #0a0a0a;
}

/* ==================== Базовые стили ==================== */
* { box-sizing: border-box; }

html, body {
    max-width: 100%;
    overflow-x: hidden;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color 0.4s ease, color 0.4s ease;
}

/* ==================== Индикатор скролла ==================== */
#scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: var(--primary);
    width: 0%;
    z-index: 2000;
    transition: width 0.1s ease-out;
}

/* ==================== Плавные переходы страниц ==================== */
#content {
    animation: fadeIn 0.3s ease-out;
    transition: opacity 0.3s ease-out, transform 0.3s ease-out;
}

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

/* ==================== Навигация ==================== */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.8rem 2rem;
    background: var(--navbar-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    color: white;
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    transition: background-color 0.4s ease;
    position: relative;
}

.logo {
    flex: 0 0 auto;
    font-weight: 700;
    color: white;
    text-decoration: none;
    display: flex;
    align-items: center;
    cursor: pointer !important;
    user-select: none;
    pointer-events: auto !important;
}

.logo span { color: var(--accent); margin-left: 5px; }
.logo i { margin-right: 8px; color: var(--accent); }

.nav-links {
    flex: 0 0 auto;
    list-style: none;
    display: flex;
    gap: 25px;
    align-items: center;
    margin: 0;
    padding: 0;
}

.nav-links a {
    color: #cbd5e1;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: color 0.3s ease;
}

.nav-links a:hover { color: white; }

#theme-toggle {
    background: transparent;
    border: 1px solid rgba(255,255,255,0.2);
    color: white;
    padding: 6px 12px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1.1rem;
    transition: transform 0.2s ease;
}

#theme-toggle:active { transform: scale(0.9); }

.burger {
    display: none;
    cursor: pointer;
    font-size: 1.5rem;
    color: white;
}

/* ==================== Основной контент ==================== */
main {
    flex: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px;
    width: 100%;
}

.hero { text-align: center; padding: 40px 10px; }

.hero h1 {
    font-size: clamp(2rem, 7vw, 3.5rem);
    margin: 0;
    color: var(--primary);
    transition: color 0.4s ease;
}

.hero h3 {
    font-size: 1.4rem;
    margin: 10px 0;
    opacity: 0.9;
    transition: color 0.4s ease;
}

.main-icon {
    display: inline-block;
    transition: color 0.4s ease, transform 0.15s ease-out;
}


.eye-svg {
    color: var(--primary);
    margin-bottom: 20px;
}


#nav-eye-container {
    position: absolute;
    left: 50%;
    top: 0;
    height: 100%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none;
}

.nav-eye {
    height: 35px;
    width: auto;
    margin: 0;
    display: block;
}

.eye-white {
    transition: fill 0.4s ease, stroke 0.4s ease;
}

.eye-highlight {
    pointer-events: none;
}

@keyframes blink {
    0%, 100% { transform: scaleY(1); }
    50% { transform: scaleY(0.1); }
}

.eye-svg.blinking {
    animation: blink 0.2s ease-in-out;
    transform-origin: center;
}

.section-subtitle {
    margin: 50px 0 25px;
    padding-left: 15px;
    border-left: 5px solid var(--primary);
    font-size: 1.5rem;
    transition: border-color 0.4s ease, color 0.4s ease;
}

/* ==================== Сетка и карточки ==================== */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
    gap: 20px;
}

.card {
    background: var(--card-bg);
    padding: 25px;
    border-radius: 15px;
    box-shadow: var(--card-shadow);
    text-decoration: none;
    color: var(--text-color);
    border: 1px solid rgba(0,0,0,0.05);
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center; 
    min-height: 150px;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.5s forwards;
    transition: background-color 0.4s ease, color 0.4s ease, transform 0.2s ease, border-color 0.4s ease, box-shadow 0.4s ease;
    text-align: center; 
}

.card i {
    font-size: 2rem;
    margin-bottom: 10px; 
    color: var(--primary);
    transition: color 0.4s ease;
    display: block; 
}

.card h3, .card p {
    text-align: center; 
}

.card p { margin: 10px 0 0; transition: color 0.4s ease; }

@keyframes fadeInUp { to { opacity: 1; transform: translateY(0); } }

.card:hover { transform: translateY(-8px); border-color: var(--primary); }

/* ==================== Кнопка "Назад" ==================== */
.btn-back {
    background: transparent;
    color: var(--text-color);
    border: 2px solid var(--text-color);
    padding: 10px 24px;
    border-radius: 8px;
    cursor: pointer;
    margin-bottom: 30px;
    font-weight: bold;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
}

.btn-back:hover {
    background: var(--text-color);
    color: var(--bg-color);
    transform: translateX(-5px);
}

.btn-back:active { transform: scale(0.95); }

/* ==================== Контакты ==================== */
.contacts-wrapper {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    gap: 20px;
    width: 100%;
}

.center-column {
    flex: 0 1 800px;
    display: flex;
    flex-direction: column;
}

.side-video {
    flex: 0 0 200px;
    max-width: 200px;
}

.puppy-video {
    width: 100%;
    border-radius: 15px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.contacts-grid {
    display: grid;
    gap: 20px;
    grid-template-columns: repeat(4, 1fr);
}

/* ==================== Секция навыков ==================== */
.skills-section {
    margin-top: 0;
    padding: 35px;
    border-radius: 20px;
    text-align: center;
    max-width: 750px;
    margin-left: auto;
    margin-right: auto;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(10px);
    transition: all 0.4s ease;
    background: var(--skills-bg);
    border: 1px solid var(--skills-border);
    color: var(--skills-text);
}

.skills-section h3 {
    margin-bottom: 25px;
    font-size: 1.6rem;
    color: #3b82f6;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.skills-section strong { color: var(--skills-strong); font-weight: 700; }

.skills-section p {
    margin: 12px 0;
    line-height: 1.6;
    font-size: 1.05rem;
}

/* ==================== Футер ==================== */
.footer {
    text-align: center;
    padding: 30px;
    background: rgba(0,0,0,0.03);
    font-size: 0.9rem;
    margin-top: 40px;
    transition: background-color 0.4s ease, color 0.4s ease;
}

/* ==================== Canvas для Matrix ==================== */
#matrix-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    display: none;
    pointer-events: none;
}

/* ==================== Easter Egg ==================== */
.easter-egg-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.95);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    cursor: pointer;
}

.easter-egg-content {
    background: #000000;
    padding: 20px;
    border: 1px solid #00ff00;
    border-radius: 10px;
    white-space: pre;
    font-family: 'Courier New', monospace;
    font-size: 9px;
    line-height: 1.1;
    color: #00ff00;
    box-shadow: 0 0 25px rgba(0, 255, 0, 0.5);
    text-align: center;
}

.protocol-title {
    font-size: 24px;
    font-weight: 900;
    color: #00ff00;
    margin-bottom: 20px;
    letter-spacing: 4px;
    text-transform: uppercase;
}

.ascii-art {
    white-space: pre;
    font-size: 8px;
    line-height: 1.1;
    color: #00ff00;
}

/* ==================== Специальные кнопки тем ==================== */
.special-toggle {
    background: transparent;
    border: none;
    color: var(--text-color);
    font-size: 1.2rem;
    cursor: pointer;
    margin-left: 15px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    padding: 5px;
    vertical-align: middle;
    animation: slideIn 0.5s ease-out;
}

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

.special-toggle:hover {
    transform: scale(1.2);
    filter: brightness(1.2);
}

#hacker-theme-btn,
#retro-theme-btn {
    display: inline-flex !important;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    color: var(--text-color);
    font-size: 1.2rem;
    cursor: pointer;
    margin-left: 15px;
    padding: 5px;
    line-height: 1;
    vertical-align: middle;
    transition: all 0.3s ease;
}

#hacker-theme-btn:hover {
    color: #00ff00;
    transform: scale(1.1);
}

/* ==================== Hacker Mode ==================== */
body.hacker-mode {
    background-color: #000 !important;
    text-shadow:
        1px 1px 2px #000,
        -1px -1px 2px #000,
        1px -1px 2px #000,
        -1px 1px 2px #000 !important;
}

body.hacker-mode #matrix-canvas {
    display: block;
    filter: blur(1px);
}

body.hacker-mode .card,
body.hacker-mode .semester-card,
body.hacker-mode .subject-card,
body.hacker-mode .btn-back {
    position: relative !important;
    z-index: 10 !important;
    background: rgba(0, 10, 0, 0.95) !important;
    border: 2px solid #00ff00 !important;
    color: #00ff00 !important;
    animation: hacker-glitch 0.3s infinite steps(2);
    box-shadow: 0 0 15px rgba(0, 255, 0, 0.5) !important;
    opacity: 1 !important;
    visibility: visible !important;
}

body.hacker-mode .btn-back {
    display: inline-flex !important;
    padding: 10px 20px;
    margin-bottom: 20px;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    text-align: center;
}

body.hacker-mode .semester-card,
body.hacker-mode .subject-card {
    padding: 20px;
    margin: 10px 0;
}

body.hacker-mode h1,
body.hacker-mode h2,
body.hacker-mode h3,
body.hacker-mode p,
body.hacker-mode .section-subtitle,
body.hacker-mode .logo,
body.hacker-mode .logo span,
body.hacker-mode i,
body.hacker-mode a {
    color: #00ff00 !important;
    text-shadow:
        2px 2px 0px #000,
        -2px -2px 0px #000,
        2px -2px 0px #000,
        -2px 2px 0px #000,
        0 0 10px rgba(0, 255, 0, 0.5) !important;
}

body.hacker-mode .subject-card span {
    color: #00ff00 !important;
    opacity: 1 !important;
    text-shadow: 0 0 5px #00ff00;
}

body.hacker-mode::before {
    content: " ";
    display: block;
    position: fixed;
    top: 0; left: 0; bottom: 0; right: 0;
    background: linear-gradient(rgba(18, 16, 16, 0) 50%, rgba(0, 0, 0, 0.15) 50%),
                linear-gradient(90deg, rgba(255, 0, 0, 0.03), rgba(0, 255, 0, 0.01), rgba(0, 0, 255, 0.03));
    z-index: 100;
    background-size: 100% 4px, 3px 100%;
    pointer-events: none;
}

body.hacker-mode #hacker-theme-btn {
    color: #00ff00 !important;
    text-shadow: 0 0 8px #00ff00;
    animation: hacker-glitch 0.3s infinite steps(2);
}

@keyframes hacker-glitch {
    0% { transform: translate(0); }
    33% { transform: translate(-2px, 1px); filter: hue-rotate(90deg); }
    66% { transform: translate(2px, -1px); }
    100% { transform: translate(0); }
}

/* ==================== Retrowave Mode ==================== */
body.retrowave-mode {
    background-color: #2b0b3d !important;
    background-image:
        linear-gradient(rgba(255, 0, 255, 0.2) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 0, 255, 0.2) 1px, transparent 1px) !important;
    background-size: 40px 40px !important;
    color: #00ffff !important;
}

body.retrowave-mode .card,
body.retrowave-mode .semester-card,
body.retrowave-mode .subject-card,
body.retrowave-mode .btn-back {
    background: rgba(20, 0, 40, 0.9) !important;
    border: 2px solid #00ffff !important;
    box-shadow: 0 0 15px #ff00ff, inset 0 0 10px #ff00ff !important;
    color: #fff !important;
    transform: skewX(-1deg);
}

body.retrowave-mode h1,
body.retrowave-mode h2,
body.retrowave-mode h3,
body.retrowave-mode .logo {
    color: #fff !important;
    text-shadow: 3px 3px #ff00ff, -2px -2px #00ffff !important;
    text-transform: uppercase;
}

body.retrowave-mode::after {
    content: "";
    position: fixed;
    bottom: -150px;
    left: 50%;
    transform: translateX(-50%);
    width: 600px;
    height: 600px;
    background: linear-gradient(#ff00ff, #ff8800);
    border-radius: 50%;
    z-index: -1;
    filter: blur(60px);
    opacity: 0.4;
    pointer-events: none;
}

body.retrowave-mode i { color: #00ffff !important; }

body.retrowave-mode .card:hover {
    box-shadow: 0 0 25px #ff00ff, 0 0 50px #00ffff !important;
}

body.retrowave-mode #retro-theme-btn {
    color: #ff00ff !important;
    text-shadow: 0 0 8px #ff00ff;
    animation: icon-pulse 1.5s infinite alternate;
}

@keyframes icon-pulse {
    from { filter: drop-shadow(0 0 2px #ff00ff); transform: scale(1); }
    to { filter: drop-shadow(0 0 8px #00ffff); transform: scale(1.15); }
}

/* ==================== Медиа-запросы ==================== */
@media (max-width: 900px) {
    .side-video { display: none; }
    .contacts-wrapper .grid { width: 100%; max-width: 100%; }
    .contacts-wrapper { flex-direction: column; align-items: center; }
    .contacts-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 700px) {
    .navbar {
        display: flex;
        flex-wrap: nowrap;
        align-items: center;
        position: relative;
    }
    .logo {
        order: 1;
        flex: 0 0 auto;
    }
    #nav-eye-container {
        position: static !important;
        left: auto !important;
        top: auto !important;
        transform: none !important;
        flex: 0 0 auto;
        margin: 0 8px;
        height: 28px !important;
        display: flex;
        align-items: center;
        justify-content: center;
        pointer-events: none;
        order: 2;
    }
    .burger {
        order: 3;
        margin-left: auto;
        flex: 0 0 auto;
    }
    .nav-eye {
        height: 28px !important;
        width: auto !important;
        margin: 0;
    }
}

@media (max-width: 768px) {
    .navbar {
        justify-content: space-between;
        padding: 0.8rem 1.5rem;
    }
    .burger { display: block; z-index: 1001; }
    .nav-container {
        position: fixed;
        top: 0;
        right: -100%;
        width: 75%;
        height: 100vh;
        background: var(--navbar-bg);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        transition: right 0.4s ease-in-out, background-color 0.4s ease;
        z-index: 1000;
        box-shadow: -10px 0 20px rgba(0,0,0,0.2);
    }
    .nav-container.active { right: 0; }
    .nav-links { flex-direction: column; gap: 35px; }
    .nav-links a {
        font-size: 1.4rem;
        color: white;
        text-decoration: none;
        transition: color 0.3s ease;
    }
    #theme-toggle { margin-top: 20px; font-size: 1.4rem; }
    .logo span { display: none; }
    .skills-section {
        margin: 30px 15px;
        padding: 25px;
        backdrop-filter: blur(5px);
    }
}

@media (max-width: 600px) {
    .contacts-grid { grid-template-columns: 1fr; }
    .easter-egg-content {
        font-size: 5px;
        padding: 10px;
    }
}