/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    height: -webkit-fill-available;
    width: 100%;
    overflow: hidden;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: #f5f5f5;
    color: #333;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    /* iOS safe area support */
    padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
}

/* Screen management */
.screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: none;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.4s ease;
    -webkit-transition: opacity 0.4s ease;
}

.screen.active {
    display: flex;
    opacity: 1;
}

/* ==================== */
/* SCREEN 1: LANDING    */
/* ==================== */
#screen-landing {
    background: #f5f5f5;
}

.landing-container {
    text-align: center;
    padding: 40px;
    max-width: 360px;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.lock-icon {
    color: #5f6368;
    margin-bottom: 20px;
}

.lock-icon svg {
    width: 48px;
    height: 48px;
}

#screen-landing h1 {
    color: #202124;
    font-size: 22px;
    font-weight: 500;
    margin-bottom: 8px;
}

#screen-landing p {
    color: #5f6368;
    font-size: 14px;
    margin-bottom: 28px;
}

.btn-primary {
    background: #1a73e8;
    color: #fff;
    border: none;
    padding: 12px 32px;
    font-size: 14px;
    font-weight: 500;
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.2s ease, box-shadow 0.2s ease;
    -webkit-transition: background 0.2s ease, box-shadow 0.2s ease;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.btn-primary:hover {
    background: #1557b0;
    box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

.btn-primary:active {
    background: #174ea6;
}

/* ==================== */
/* SCREEN 2: CAPTCHA    */
/* ==================== */
#screen-captcha {
    background: rgba(0, 0, 0, 0.5);
}

.captcha-container {
    background: #fff;
    border-radius: 3px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.3);
    overflow: hidden;
    width: 300px;
    max-width: 95vw;
}

.captcha-header {
    background: #fff;
    color: #202124;
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid #e0e0e0;
}

.captcha-prompt {
    font-size: 15px;
    line-height: 1.4;
}

.captcha-prompt strong {
    font-weight: 700;
}

.captcha-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2px;
    padding: 2px;
    background: #fff;
}

.captcha-cell {
    position: relative;
    aspect-ratio: 1;
    background: #f0f0f0;
    cursor: pointer;
    overflow: hidden;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

/* Fallback for browsers without aspect-ratio support */
@supports not (aspect-ratio: 1) {
    .captcha-cell {
        padding-bottom: 100%;
        height: 0;
    }
    .captcha-cell > * {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
    }
}

.captcha-cell img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.15s ease;
    -webkit-transition: transform 0.15s ease;
}

.captcha-cell:active img {
    transform: scale(0.95);
    -webkit-transform: scale(0.95);
}

/* Placeholder styling for development */
.captcha-cell .placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 10px;
    color: #fff;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.3);
}

.captcha-cell .placeholder.me {
    background: linear-gradient(135deg, #4a8cca 0%, #3a7bc8 100%);
}

.captcha-cell .placeholder.decoy {
    background: linear-gradient(135deg, #7ab547 0%, #5a9a32 100%);
}

/* Selection overlay - checkmark style like real captcha */
.captcha-cell .overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: flex-end;
    justify-content: flex-start;
    opacity: 0;
    transition: opacity 0.15s ease;
    -webkit-transition: opacity 0.15s ease;
    pointer-events: none;
}

.captcha-cell.selected .overlay {
    opacity: 1;
}

.captcha-cell.selected .overlay {
    background: transparent;
}

.captcha-cell.selected.correct .check-circle,
.captcha-cell.selected.wrong .check-circle {
    display: flex;
}

.check-circle {
    display: none;
    position: absolute;
    bottom: 4px;
    left: 4px;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: #4285f4;
    align-items: center;
    justify-content: center;
    box-shadow: 0 1px 3px rgba(0,0,0,0.3);
}

.captcha-cell.selected.wrong .check-circle {
    background: #ea4335;
}

.check-circle svg {
    width: 16px;
    height: 16px;
    fill: #fff;
}

.overlay-icon {
    display: none;
}

/* Border highlight on selection */
.captcha-cell.selected {
    box-shadow: inset 0 0 0 3px #4285f4;
}

.captcha-cell.selected.wrong {
    box-shadow: inset 0 0 0 3px #ea4335;
}

/* Captcha footer - matches Google style */
.captcha-footer {
    padding: 12px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-top: 1px solid #e0e0e0;
    background: #f9f9f9;
}

.captcha-icons {
    display: flex;
    gap: 8px;
}

.icon-btn {
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    cursor: pointer;
    color: #70757a;
    padding: 4px;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.2s ease;
    -webkit-transition: color 0.2s ease;
    -webkit-tap-highlight-color: transparent;
}

.icon-btn:hover {
    color: #202124;
}

.icon-btn:active {
    background: rgba(0, 0, 0, 0.05);
}

.btn-verify {
    background: #4285f4;
    color: #fff;
    border: none;
    padding: 10px 24px;
    font-size: 14px;
    font-weight: 500;
    border-radius: 3px;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: background 0.2s ease, box-shadow 0.2s ease;
    -webkit-transition: background 0.2s ease, box-shadow 0.2s ease;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.btn-verify:hover {
    background: #3b78e7;
    box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

.btn-verify:active {
    background: #3367d6;
}

/* ==================== */
/* SCREEN 3: VALENTINE  */
/* ==================== */
#screen-valentine {
    background: url('../images/background.jpg') 70% center / cover no-repeat;
    background-color: #2c3e50;
    overflow: hidden;
}

.valentine-container {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    padding-left: 5%;
}

.hearts-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    overflow: hidden;
}

.floating-emoji {
    position: absolute;
    bottom: -100px;
    opacity: 0;
    animation: float-up 6s ease-out forwards;
    -webkit-animation: float-up 6s ease-out forwards;
    object-fit: contain;
}

@keyframes float-up {
    0% {
        transform: translateY(0) rotate(0deg) scale(0.8);
        opacity: 0;
    }
    10% {
        opacity: 0.9;
    }
    85% {
        opacity: 0.9;
    }
    100% {
        transform: translateY(var(--travel-distance, -110vh)) rotate(15deg) scale(1);
        opacity: 0;
    }
}

@-webkit-keyframes float-up {
    0% {
        -webkit-transform: translateY(0) rotate(0deg) scale(0.8);
        opacity: 0;
    }
    10% {
        opacity: 0.9;
    }
    85% {
        opacity: 0.9;
    }
    100% {
        -webkit-transform: translateY(var(--travel-distance, -110vh)) rotate(15deg) scale(1);
        opacity: 0;
    }
}

.valentine-content {
    position: relative;
    z-index: 10;
    text-align: left;
    padding: 40px 24px;
    max-width: 420px;
    animation: fade-in 0.8s ease-out;
    -webkit-animation: fade-in 0.8s ease-out;
}

@keyframes fade-in {
    0% {
        transform: translateY(20px);
        opacity: 0;
    }
    100% {
        transform: translateY(0);
        opacity: 1;
    }
}

@-webkit-keyframes fade-in {
    0% {
        -webkit-transform: translateY(20px);
        opacity: 0;
    }
    100% {
        -webkit-transform: translateY(0);
        opacity: 1;
    }
}

.valentine-title {
    font-size: 36px;
    color: #fff;
    margin-bottom: 24px;
    font-weight: 600;
    letter-spacing: -0.5px;
    text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.4);
}

.valentine-message {
    background: rgba(255, 255, 255, 0.4);
    padding: 32px;
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
    margin-bottom: 24px;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.valentine-message p {
    font-size: 17px;
    color: #2c3e50;
    line-height: 1.7;
    margin-bottom: 16px;
}

.valentine-message p:last-child {
    margin-bottom: 0;
}

.message-greeting {
    font-size: 20px !important;
    font-weight: 600;
    color: #c0392b !important;
}

.time-counter {
    font-weight: 600;
    color: #2980b9;
}

.message-closing {
    margin-top: 24px !important;
    font-style: italic;
}

.message-signature {
    font-size: 20px !important;
    font-weight: 600;
    color: #c0392b !important;
    margin-top: 8px !important;
}

.valentine-footer {
    color: #fff;
    font-size: 16px;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 12px;
    font-weight: 500;
    text-shadow: 1px 1px 4px rgba(0, 0, 0, 0.4);
}

.heart-emoji {
    font-size: 20px;
}

/* Floating media container for future GIFs */
.floating-media {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 5;
}

/* ==================== */
/* FAILURE POPUP        */
/* ==================== */
.popup {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    transition: opacity 0.3s ease;
    -webkit-transition: opacity 0.3s ease;
}

.popup.active {
    display: flex;
    opacity: 1;
}

.popup-content {
    background: #fff;
    padding: 40px;
    border-radius: 16px;
    text-align: center;
    max-width: 320px;
    margin: 20px;
    animation: shake 0.5s ease;
    -webkit-animation: shake 0.5s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20% { transform: translateX(-10px); }
    40% { transform: translateX(10px); }
    60% { transform: translateX(-10px); }
    80% { transform: translateX(10px); }
}

@-webkit-keyframes shake {
    0%, 100% { -webkit-transform: translateX(0); }
    20% { -webkit-transform: translateX(-10px); }
    40% { -webkit-transform: translateX(10px); }
    60% { -webkit-transform: translateX(-10px); }
    80% { -webkit-transform: translateX(10px); }
}

.popup-image {
    margin-bottom: 16px;
}

.popup-image img {
    width: 120px;
    height: 120px;
    object-fit: contain;
}

.popup-content h2 {
    color: #e74c3c;
    font-size: 24px;
    margin-bottom: 12px;
}

.popup-content p {
    color: #666;
    font-size: 16px;
    line-height: 1.5;
}

.btn-retry {
    margin-top: 20px;
    background: #1a73e8;
    color: #fff;
    border: none;
    padding: 12px 32px;
    font-size: 14px;
    font-weight: 500;
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.2s ease;
    -webkit-transition: background 0.2s ease;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.btn-retry:hover {
    background: #1557b0;
}

.btn-retry:active {
    background: #174ea6;
}

/* ==================== */
/* RESPONSIVE           */
/* ==================== */
@media (max-width: 360px) {
    .captcha-container {
        width: 290px;
    }

    .valentine-title {
        font-size: 28px;
    }

    .valentine-message p {
        font-size: 16px;
    }
}

@media (max-width: 600px) {
    .valentine-container {
        justify-content: center;
        padding-left: 0;
        padding: 20px;
    }

    .valentine-content {
        text-align: center;
        max-width: 100%;
    }

    .valentine-footer {
        justify-content: center;
    }

    #screen-valentine {
        background-image: url('../images/background-mobile.jpg');
        background-position: center top;
        background-size: cover;
    }
}

@media (min-width: 768px) {
    .valentine-title {
        font-size: 42px;
    }

    .valentine-message {
        padding: 32px;
    }

    .valentine-message p {
        font-size: 18px;
    }
}