/* SDAESI - Modern Premium Design System */

:root {
    --primary: #5a2ca0;
    --primary-light: #7b4dd1;
    --primary-dark: #3d1a6b;
    --accent: #f2b705;
    --accent-light: #ffd84d;
    --bg-light: #f8f9ff;
    --bg-dark: #121212;
    --text-dark: #2a2a2a;
    --text-light: #e0e0e0;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 5px 20px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.2);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}

body {
    background: linear-gradient(135deg, #f8f9ff 0%, #f0f1ff 100%);
    color: var(--text-dark);
    transition: var(--transition);
    min-height: 100vh;
}

/* ============================================
   NAVBAR STYLES
   ============================================ */

nav {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    display: flex;
    align-items: center;
    padding: 16px 40px;
    color: white;
    box-shadow: var(--shadow-lg);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 700;
    font-size: 18px;
    letter-spacing: 0.5px;
    transition: var(--transition);
    cursor: pointer;
}

.logo-area:hover {
    transform: scale(1.05);
}

.logo-small {
    height: 45px;
    filter: brightness(1.1);
    transition: var(--transition);
}

.logo-small:hover {
    filter: brightness(1.2) drop-shadow(0 0 8px rgba(255, 255, 255, 0.5));
}

nav ul {
    list-style: none;
    display: flex;
    gap: 35px;
    margin-left: auto;
}

nav ul li a {
    color: white;
    text-decoration: none;
    transition: var(--transition);
    font-weight: 500;
    position: relative;
    padding-bottom: 5px;
}

nav ul li a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: var(--transition);
}

nav ul li a:hover::after {
    width: 100%;
}

#darkmode-toggle {
    margin-left: 30px;
    padding: 8px 14px;
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 8px;
    cursor: pointer;
    font-size: 18px;
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

#darkmode-toggle:hover {
    background: rgba(255, 255, 255, 0.35);
    transform: scale(1.1);
}

/* ============================================
   HERO SECTION
   ============================================ */

.hero {
    height: 70vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: linear-gradient(135deg, rgba(90, 44, 160, 0.05) 0%, rgba(123, 77, 209, 0.05) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle, rgba(123, 77, 209, 0.1) 0%, transparent 70%);
    animation: float 20s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    50% { transform: translate(30px, -30px) rotate(180deg); }
}

.hero-box {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    padding: 70px 60px;
    border-radius: 20px;
    color: white;
    box-shadow: var(--shadow-lg);
    max-width: 900px;
    position: relative;
    z-index: 2;
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    transition: var(--transition);
}

.hero-box:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 60px rgba(90, 44, 160, 0.3);
}

.hero-logo {
    width: 130px;
    margin-bottom: 20px;
    animation: bounce 3s ease-in-out infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

.hero h1 {
    font-size: 48px;
    margin-bottom: 15px;
    font-weight: 700;
    letter-spacing: -1px;
}

.hero p {
    font-size: 20px;
    margin-bottom: 30px;
    font-weight: 300;
    opacity: 0.95;
}

.enroll-btn {
    margin-top: 20px;
    background: var(--accent);
    color: var(--text-dark);
    padding: 14px 40px;
    border: none;
    border-radius: 50px;
    font-weight: 700;
    cursor: pointer;
    font-size: 16px;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(242, 183, 5, 0.3);
    letter-spacing: 0.5px;
}

.enroll-btn:hover {
    background: var(--accent-light);
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(242, 183, 5, 0.4);
}

/* ============================================
   ADMIN SECTION
   ============================================ */

.admin-section {
    text-align: center;
    margin: 50px 0;
}

.admin-btn {
    padding: 12px 32px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: white;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
    letter-spacing: 0.5px;
}

.admin-btn:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(90, 44, 160, 0.3);
}

/* ============================================
   GENERAL SECTIONS
   ============================================ */

.section {
    padding: 100px 10%;
    text-align: center;
    border-top: 1px solid rgba(90, 44, 160, 0.1);
    position: relative;
}

.section::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    width: 3px;
    height: 50px;
    background: linear-gradient(to bottom, var(--primary), transparent);
    margin-left: 5%;
}

.section h2 {
    color: var(--primary);
    margin-bottom: 30px;
    font-size: 36px;
    font-weight: 700;
    position: relative;
    display: inline-block;
}

.section h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(to right, var(--primary), var(--accent));
    border-radius: 2px;
}

.section p {
    font-size: 16px;
    line-height: 1.8;
    color: #555;
    max-width: 700px;
    margin: 20px auto;
}

/* ============================================
   VIDEO SECTION
   ============================================ */

.video-container {
    margin-top: 40px;
}

video {
    width: 100%;
    max-width: 800px;
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    margin: 20px auto;
    display: block;
    transition: var(--transition);
}

video:hover {
    transform: scale(1.02);
    box-shadow: 0 15px 50px rgba(90, 44, 160, 0.25);
}

/* ============================================
   GALLERY SECTION
   ============================================ */

.gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
    margin-top: 40px;
}

.gallery img {
    width: 100%;
    height: 220px;
    object-fit: cover;
    border-radius: 16px;
    transition: var(--transition);
    cursor: pointer;
    box-shadow: var(--shadow-md);
}

.gallery img:hover {
    transform: scale(1.08) translateY(-8px);
    box-shadow: 0 15px 40px rgba(90, 44, 160, 0.25);
}

/* ============================================
   ANNOUNCEMENTS SECTION
   ============================================ */

.announcements-container {
    max-width: 800px;
    margin: 40px auto;
}

.announcement {
    background: white;
    padding: 30px;
    border-left: 5px solid var(--primary);
    margin: 25px auto;
    text-align: left;
    box-shadow: var(--shadow-md);
    border-radius: 12px;
    transition: var(--transition);
    position: relative;
}

.announcement::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(to right, var(--primary), var(--primary-light));
    border-radius: 12px 12px 0 0;
}

.announcement:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-6px);
}

.announcement h4 {
    color: var(--primary);
    margin-bottom: 12px;
    font-size: 20px;
    font-weight: 700;
}

.announcement p {
    color: #666;
    line-height: 1.8;
    font-size: 15px;
}

/* ============================================
   FOOTER
   ============================================ */

footer {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: white;
    text-align: center;
    padding: 40px 20px;
    margin-top: 60px;
    font-size: 14px;
    box-shadow: 0 -5px 30px rgba(0, 0, 0, 0.1);
}

footer p {
    font-weight: 500;
    letter-spacing: 0.3px;
}

/* ============================================
   CHAT STYLES
   ============================================ */

.chat-toggle {
    position: fixed;
    bottom: 30px;
    left: 20px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: white;
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 42px;
    cursor: pointer;
    border: none;
    box-shadow: 0 8px 35px rgba(90, 44, 160, 0.5);
    transition: var(--transition);
    z-index: 1000;
}

.chat-toggle:hover {
    transform: scale(1.15) translateY(-5px);
    box-shadow: 0 15px 50px rgba(90, 44, 160, 0.6);
}

.chat-toggle:active {
    transform: scale(0.92);
}

.chatbot {
    position: fixed;
    bottom: 110px;
    left: 20px;
    width: 400px;
    background: white;
    border-radius: 24px;
    box-shadow: 0 20px 70px rgba(90, 44, 160, 0.35);
    overflow: hidden;
    display: none;
    z-index: 1001;
    flex-direction: column;
    border: none;
    animation: slideUp 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    height: 600px;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px) scale(0.9);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.chat-header {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: white;
    padding: 18px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 700;
    font-size: 16px;
    box-shadow: 0 4px 12px rgba(90, 44, 160, 0.2);
}

.minimize-btn {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: white;
    font-size: 22px;
    cursor: pointer;
    transition: var(--transition);
    padding: 6px 10px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.minimize-btn:hover {
    background: rgba(255, 255, 255, 0.35);
    transform: scale(1.15);
}

.chat-box {
    height: 450px;
    overflow-y: auto;
    padding: 20px 24px;
    background: linear-gradient(135deg, #f8f9ff 0%, #f0f1ff 100%);
    flex-grow: 1;
}

.chat-box::-webkit-scrollbar {
    width: 6px;
}

.chat-box::-webkit-scrollbar-track {
    background: transparent;
}

.chat-box::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 3px;
}

.chat-box::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

.chat-box div {
    margin-bottom: 16px;
    padding: 14px 16px;
    background: white;
    border-radius: 16px;
    border-left: none;
    box-shadow: 0 4px 15px rgba(90, 44, 160, 0.12);
    animation: messageSlide 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    line-height: 1.6;
    word-wrap: break-word;
    font-size: 15px;
    color: #333;
}

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

.chat-box div strong {
    color: var(--primary);
    font-weight: 600;
}

.chat-input-area {
    display: flex;
    border-top: 1px solid #f0f0f0;
    background: white;
    gap: 0;
    padding: 16px 24px;
    border-radius: 0 0 24px 24px;
}

.chat-input {
    flex: 1;
    border: 2px solid #f0f0f0;
    padding: 12px 16px;
    font-size: 15px;
    font-family: 'Poppins', sans-serif;
    outline: none;
    background: #f9fafb;
    color: var(--text-dark);
    transition: var(--transition);
    border-radius: 24px;
    margin-right: 12px;
}

.chat-input::placeholder {
    color: #aaa;
    font-weight: 400;
}

.chat-input:focus {
    background: white;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(90, 44, 160, 0.1);
}

.chat-send-btn {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: white;
    border: none;
    padding: 0;
    cursor: pointer;
    font-weight: 700;
    font-size: 22px;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    letter-spacing: 0;
    border-radius: 50%;
    width: 44px;
    height: 44px;
    min-width: 44px;
    flex-shrink: 0;
    box-shadow: 0 4px 16px rgba(90, 44, 160, 0.35);
    position: relative;
}

.chat-send-btn:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    box-shadow: 0 8px 28px rgba(90, 44, 160, 0.5);
    transform: scale(1.12) translateY(-2px);
}

.chat-send-btn:active {
    transform: scale(0.88);
    box-shadow: 0 2px 8px rgba(90, 44, 160, 0.3);
}

/* ============================================
   DARK MODE STYLES
   ============================================ */

body.dark-mode {
    background: linear-gradient(135deg, #1a1a1a 0%, #222 100%);
    color: var(--text-light);
}

body.dark-mode nav {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
    box-shadow: 0 5px 30px rgba(0, 0, 0, 0.5);
}

body.dark-mode .hero {
    background: linear-gradient(135deg, rgba(90, 44, 160, 0.15) 0%, rgba(123, 77, 209, 0.15) 100%);
}

body.dark-mode .hero-box {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
}

body.dark-mode .section {
    background: #1f1f1f;
    border-top-color: rgba(255, 255, 255, 0.1);
}

body.dark-mode .section h2 {
    color: #b892e8;
}

body.dark-mode .section p {
    color: #b0b0b0;
}

body.dark-mode .announcement {
    background: #2a2a2a;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
}

body.dark-mode .announcement h4 {
    color: #b892e8;
}

body.dark-mode .announcement p {
    color: #d0d0d0;
}

body.dark-mode footer {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
}

body.dark-mode video {
    border-color: rgba(255, 255, 255, 0.1);
}

body.dark-mode .gallery img {
    border-color: rgba(255, 255, 255, 0.1);
}

body.dark-mode .chatbot {
    background: #2a2a2a;
    border-color: var(--primary);
}

body.dark-mode .chat-box {
    background: linear-gradient(135deg, #1f1f1f 0%, #252525 100%);
}

body.dark-mode .chat-box div {
    background: #333;
    color: #e0e0e0;
    border-left-color: var(--primary-light);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

body.dark-mode .chat-box div strong {
    color: var(--primary-light);
}

body.dark-mode .chat-input {
    background: #333;
    color: #e0e0e0;
    border: none;
}

body.dark-mode .chat-input::placeholder {
    color: #666;
}

body.dark-mode .chat-input-area {
    border-top-color: #444;
    background: #2a2a2a;
}

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

@media (max-width: 768px) {
    nav {
        flex-direction: column;
        padding: 12px 20px;
        gap: 12px;
    }

    nav ul {
        flex-wrap: wrap;
        justify-content: center;
        margin-left: 0;
        gap: 12px;
    }

    nav ul li a {
        font-size: 14px;
    }

    .hero {
        height: auto;
        padding: 50px 20px;
    }

    .hero-box {
        padding: 40px 25px;
    }

    .hero h1 {
        font-size: 32px;
    }

    .hero p {
        font-size: 16px;
    }

    .section {
        padding: 60px 5%;
    }

    .section h2 {
        font-size: 28px;
    }

    .gallery {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
        gap: 15px;
    }

    .gallery img {
        height: 150px;
    }

    .announcement {
        padding: 20px;
    }

    .chatbot {
        width: 90%;
        right: 5%;
        bottom: 80px;
    }
}

@media (max-width: 480px) {
    nav {
        padding: 10px;
    }

    nav ul {
        gap: 8px;
    }

    nav ul li a {
        font-size: 12px;
    }

    .hero-box {
        padding: 25px;
    }

    .hero h1 {
        font-size: 24px;
    }

    .hero p {
        font-size: 14px;
    }

    .enroll-btn {
        padding: 12px 24px;
        font-size: 14px;
    }

    .section {
        padding: 40px 3%;
    }

    .section h2 {
        font-size: 22px;
    }

    .gallery {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .gallery img {
        height: 180px;
    }

    .chatbot {
        width: 95%;
        right: 2.5%;
        height: 80vh;
    }

    #darkmode-toggle {
        padding: 6px 10px;
        font-size: 16px;
    }

    .admin-btn {
        padding: 10px 24px;
        font-size: 14px;
    }
}