/* ========================================
   Elegant Color Palette
   ======================================== */
:root {
    --bg-primary: #FDFBF7;
    --bg-secondary: #F7F4EF;
    --bg-accent: #EDE8E0;
    --text-primary: #2C2825;
    --text-secondary: #5C5651;
    --text-muted: #8A847D;
    --accent-warm: #C4A98A;
    --button-primary: #2C2825;
    --button-hover: #4A4540;
    --shadow-soft: 0 2px 20px rgba(44, 40, 37, 0.06);
    --font-serif: 'Georgia', 'Times New Roman', serif;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.5rem;
    --space-lg: 2.5rem;
    --space-xl: 4rem;
}

/* ========================================
   Base Reset
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
    font-family: var(--font-serif);
    font-weight: 400;
}

/* ========================================
   Screen Container
   ======================================== */
.screen {
    min-height: 100vh;
    min-height: 100dvh;
    display: none;
    position: relative;
    overflow: hidden;
}

.screen.active {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

/* ========================================
   Password Screen
   ======================================== */
#password-screen {
    background: var(--bg-primary);
}

.password-container {
    text-align: center;
    padding: var(--space-lg);
    max-width: 340px;
    width: 90%;
}

.lock-icon {
    font-size: 2rem;
    margin-bottom: var(--space-md);
    opacity: 0.7;
}

.password-container h2 {
    font-size: 1.25rem;
    font-weight: 400;
    margin-bottom: var(--space-xs);
    letter-spacing: 0.1em;
}

.hint-text {
    color: var(--text-muted);
    margin-bottom: var(--space-lg);
    font-size: 0.875rem;
    letter-spacing: 0.05em;
}

#password-input {
    width: 100%;
    padding: 1rem;
    border: 1px solid var(--bg-accent);
    border-radius: 4px;
    font-size: 1rem;
    text-align: center;
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: border-color 0.3s;
    outline: none;
    letter-spacing: 0.2em;
}

#password-input:focus {
    border-color: var(--accent-warm);
}

.btn-primary {
    width: 100%;
    padding: 1rem;
    margin-top: var(--space-sm);
    border: none;
    border-radius: 4px;
    background: var(--button-primary);
    color: var(--bg-primary);
    font-size: 0.875rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    cursor: pointer;
    transition: background 0.3s;
}

.btn-primary:hover {
    background: var(--button-hover);
}

.error-text {
    color: #B5838D;
    margin-top: var(--space-sm);
    font-size: 0.875rem;
    min-height: 1.4em;
}

/* ========================================
   Cover Screen
   ======================================== */
#cover-screen {
    background: var(--bg-primary);
}

.cover-content {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-lg);
    position: relative;
}

.cover-text {
    text-align: center;
    z-index: 1;
}

.cover-text h1 {
    font-size: 1.75rem;
    font-weight: 400;
    letter-spacing: 0.15em;
    margin-bottom: var(--space-md);
}

.cover-text p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    letter-spacing: 0.2em;
    text-transform: uppercase;
}

.typewriter-cursor {
    opacity: 0.6;
    animation: blink 1.2s ease-in-out infinite;
}

@keyframes blink {
    0%, 45% { opacity: 0.6; }
    50%, 100% { opacity: 0; }
}

.scroll-hint {
    position: absolute;
    bottom: var(--space-xl);
    text-align: center;
    color: var(--text-muted);
    font-size: 0.75rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    cursor: pointer;
    padding: 1rem 2rem;
    transition: color 0.3s;
    z-index: 10;
}

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

.scroll-arrow {
    font-size: 1rem;
    margin-top: var(--space-xs);
    animation: drift 2.5s ease-in-out infinite;
}

@keyframes drift {
    0%, 100% { transform: translateY(0); opacity: 0.5; }
    50% { transform: translateY(8px); opacity: 1; }
}

/* ========================================
   Photo Slides - Full Screen with Background
   ======================================== */
.photo-slide {
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    position: relative;
}

.slide-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        to bottom,
        rgba(0, 0, 0, 0.1) 0%,
        rgba(0, 0, 0, 0.3) 50%,
        rgba(0, 0, 0, 0.6) 100%
    );
    pointer-events: none;
}

.slide-content {
    position: absolute;
    bottom: 15%;
    left: 0;
    right: 0;
    padding: 0 var(--space-lg);
    text-align: center;
    color: white;
    z-index: 2;
}

.slide-date {
    font-size: 0.75rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    opacity: 0.8;
    margin-bottom: var(--space-xs);
}

.slide-title {
    font-size: 1.75rem;
    font-weight: 400;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-sm);
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.slide-caption {
    font-size: 0.95rem;
    line-height: 1.8;
    opacity: 0.9;
    max-width: 320px;
    margin: 0 auto;
}

.slide-nav {
    position: absolute;
    bottom: var(--space-lg);
    left: 50%;
    transform: translateX(-50%);
    color: white;
    opacity: 0.6;
    font-size: 1.2rem;
    animation: drift 2.5s ease-in-out infinite;
    cursor: pointer;
    padding: 1rem;
    z-index: 10;
}

.slide-nav:hover {
    opacity: 1;
}

/* Slide backgrounds */
#slide-1 { background-image: url('../assets/photos/01-first-date.jpg'); }
#slide-2 { background-image: url('../assets/photos/02-polaroids-2019.jpg'); }
#slide-3 { background-image: url('../assets/photos/03-serbia-cat.jpg'); }
#slide-4 { background-image: url('../assets/photos/04-serbia-together.jpg'); }
#slide-5 { background-image: url('../assets/photos/05-serbia-shadow.jpg'); }
#slide-6 { background-image: url('../assets/photos/06-baikal-forest.jpg'); }
#slide-7 { background-image: url('../assets/photos/07-baikal-camera.jpg'); }
#slide-8 { background-image: url('../assets/photos/08-baikal-blue.jpg'); }
#slide-9 { background-image: url('../assets/photos/09-kitchen-sunset.jpg'); }
#slide-10 { background-image: url('../assets/photos/11-como-sunset.jpg'); }
#slide-11 { background-image: url('../assets/photos/12-como-breakfast.jpg'); }
#slide-12 { background-image: url('../assets/photos/13-france-garden.jpg'); }
#slide-13 { background-image: url('../assets/photos/10-polaroid-blur.jpg'); }

/* ========================================
   Proposal Screen
   ======================================== */
#proposal-screen {
    background: var(--bg-secondary);
}

.proposal-container {
    width: 100%;
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-lg);
}

.proposal-content {
    text-align: center;
    max-width: 400px;
}

.proposal-message {
    font-size: 1.1rem;
    line-height: 2.2;
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
}

.proposal-question {
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--text-primary);
    margin-bottom: var(--space-lg);
    letter-spacing: 0.1em;
}

.proposal-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    align-items: center;
}

.btn-yes {
    padding: 1rem 3rem;
    border: none;
    border-radius: 4px;
    background: var(--text-primary);
    color: var(--bg-primary);
    font-size: 1rem;
    letter-spacing: 0.1em;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-yes:hover {
    background: var(--button-hover);
}

.btn-no {
    padding: 0.75rem 1.5rem;
    border: 1px solid var(--bg-accent);
    border-radius: 4px;
    background: transparent;
    color: var(--text-muted);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.3s;
}

/* ========================================
   Confirmation Screen
   ======================================== */
#confirmation-screen {
    background: var(--bg-primary);
}

.confirmation-container {
    width: 100%;
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-lg);
    position: relative;
}

.confetti-container {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    overflow: hidden;
}

.confetti {
    position: absolute;
    width: 8px;
    height: 8px;
    background: var(--accent-warm);
    animation: confetti-fall 3s ease-out forwards;
}

@keyframes confetti-fall {
    0% {
        transform: translateY(-100%) rotate(0deg);
        opacity: 1;
    }
    100% {
        transform: translateY(100vh) rotate(720deg);
        opacity: 0;
    }
}

.confirmation-content {
    text-align: center;
    z-index: 1;
    max-width: 400px;
}

.confirmation-content h1 {
    font-size: 1.75rem;
    font-weight: 400;
    color: var(--text-primary);
    margin-bottom: var(--space-lg);
    letter-spacing: 0.1em;
}

.confirmation-text {
    font-size: 1.1rem;
    line-height: 2;
    color: var(--text-secondary);
}

/* ========================================
   Photo Viewer Modal
   ======================================== */
.photo-viewer {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1000;
    display: none;
}

.photo-viewer.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.viewer-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(28, 26, 24, 0.95);
}

.viewer-content {
    position: relative;
    z-index: 1;
    max-width: 90%;
    max-height: 80%;
}

.viewer-close {
    position: absolute;
    top: -44px;
    right: 0;
    width: 36px;
    height: 36px;
    border: none;
    background: transparent;
    color: rgba(255, 255, 255, 0.7);
    font-size: 1.5rem;
    cursor: pointer;
}

.viewer-image-container img {
    max-width: 100%;
    max-height: 70vh;
}

/* ========================================
   Responsive
   ======================================== */
@media (min-width: 768px) {
    .cover-text h1 {
        font-size: 2.25rem;
    }

    .slide-title {
        font-size: 2.25rem;
    }

    .slide-caption {
        font-size: 1rem;
        max-width: 400px;
    }

    .proposal-question {
        font-size: 1.75rem;
    }
}

/* ========================================
   Utilities
   ======================================== */
.hidden {
    display: none !important;
}

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

@keyframes slideUp {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}